Ok I ran Magicjack for about a year on my 4300 here is how I set it up.
Under GameFuel rules use this..
MajicJack 3 1 192.168.1.3-255.255.255.255 0.0.0.0-255.255.255.255
UDP 49160-49170/0-65535
MajicJack 2 1 192.168.1.3-255.255.255.255 0.0.0.0-255.255.255.255
UDP 56560-56570/0-65535
MagicJack 1 1 192.168.1.3-255.255.255.255 0.0.0.0-255.255.255.255
UDP 3270-3280/0-65535